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Optical Multilayer Coatings for Ultrafast Lasers

Friday November 10, 2017
1:00 pm

 Presenter:  Dr. Michael Trubetskov, Max Planck Institute of Quantum Optics
 Series:  OSE Seminars
 Abstract:  Within the last two decades, dispersive dielectric multilayer mirrors have played a significant role in the progress of ultrafast science. Continuous progress in the design, manufacturing, and characterization of multilayer structures is strongly dependent on powerful numerical methods. The analysis of multilayer coatings is based on matrix algorithm, which can be derived directly from Maxwell equations. The computations of group delay and group delay dispersion have specific features and complications, requiring special precautions in describing material dispersion. The design problem is usually formulated in a variational form, and due to existence of multiple extrema this non-convex problem is very complicated. Modern design methods based on needle optimization and gradual evolution approaches will be considered and demonstrated during the presentation. Several mirrors for different wavelength regions, bandwidths, GDD levels will be shown. At the concluding part, I am going to discuss non-linear effects in multilayers significantly affecting their properties at high intensities. One example will be a UV mirror where two-photon absorption plays significant role, another example will be a special filter with sharp transition zone utilizing Kerr nonlinearity.
 Host:  Wolfgang Rudolph
 Location:  Room 190, Physics & Astronomy

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